OK I'm joining this conversation a little late but I'll add my bit. The thing that is always most noticeable to me when travelling/visiting the US is how clean it is at street level. Its really difficult to spot litter or rubbish even in city centres or along the highways whereas in the UK,a lot of the population think nothing of throwing rubbish on the streets be it fast food wrappers,alcohol containers,cigraette ends,general itter,even used condoms. The other thnig is this trend for people to be walking down the street swigging cheap alcohol from open containers. Sign of a badly broken society.